Genuine OEM Audi Gear Oil Cooler, part number 420317021D. This vital component is responsible for reducing the operating temperature of the transmission fluid, which is crucial for preventing overheating and ensuring the longevity and efficient operation of the transmission. It is an integral part of the transmission's cooling system. The cooler features a finned heat exchanger design, weighs approximately 1.517 kg, and measures 0.485m in length. Installing a genuine OEM gear oil cooler guarantees the correct heat exchange capacity, proper fluid flow, and durable construction to withstand thermal cycles and vibrations, protecting your transmission from premature wear.